This interesting circuit was found in a 90’s American documentation. The circuit has a maximum current of 20 A and uses a transformer with the characteristics given next to the diagram.
We found this circuit in a 1977 National Semiconductor Databook. The circuit can use other FETs...
This 6-transistor circuit had excellent sensitivity using germanium transistors. The push-pull stage...
In the figure we have the way to use a TTL 7413 port as a low frequency oscillator making an LED...